I'm planning to use raspberry pi 4 for homebridge. I will not be connecting any display or any input device and will use ethernet cable for network. will 5v 2amp adapter be sufficient for power?

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A display or input device will generally consume negligible power so are irrelevant.

The Foundation has various recommendations, but lists "Typical bare-board active current consumption" as 600mA, so a quality 2A supply should easily run the Pi4.

See Raspberry Pi Power Limitations

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